The TCM detects an electrical fault on transmission pressure control solenoid R. Hydraulic pressure cannot be modulated as expected, causing harsh or slipping shifts.
Medium severity. Can I keep driving?Drive as little as possible and gently. If the transmission slips or stays in one gear, go slowly to a repair shop or call for a tow truck.
Most likely causes
- Internal solenoid fault
- Wiring or connector fault
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: hard
- It can trigger limp mode.
What each character of P27CB means
- P: Powertrain: engine and transmission
- 2: Generic code: same on every make
- 7: Transmission
- CB: Specific fault in that system
Frequently asked questions
Can I keep driving with code P27CB?
Drive as little as possible and gently. If the transmission slips or stays in one gear, go slowly to a repair shop or call for a tow truck.
What causes code P27CB?
The most common causes are: internal solenoid fault; wiring or connector fault.
Related codes
- P27C3Pressure Control Solenoid P Electrical
- P27D3Pressure Control Solenoid S Electrical
- P27BBPressure Control Solenoid N Electrical
- P27DBPressure Control Solenoid T Electrical
- P2810Pressure Control Solenoid G Electrical
- P2819Pressure Control Solenoid H Electrical
- P2822Pressure Control Solenoid J Electrical
- P282BPressure Control Solenoid K Electrical
Sources
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.